Radio receiver having improved signal-to-noise ratio for receiving voice and data signals

摘要: A radio receiver having a frequency converter which converts an RF signal into IF signal. An filter filters the to provide filtered output discriminator. The discriminator discriminates produce baseband From signal, voice is recovered and data extracted. Using field detector detects electromagnetic strength of outputs detect when higher than predetermined level. sync in extracted signals, controller controls bandwidth so that S/N ratio increased error rate decreased. may also be obtained by noise level component from positioned adjacent portion band.